Tracer Release Flow Shunt Chamber for Wellbore Pressure Gradient Estimation
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Solution Overview
Problem
Current methods for estimating wellbore pressure drawdown along tubing joints in petroleum wells are inadequate, as they fail to accurately model the inflow profile due to limitations in measuring pressure gradients and fluid flow rates within the wellbore.
Innovation Solution
A petroleum well tracer release flow shunt chamber is arranged in an annulus space around a base pipe, featuring a tracer system that releases unique tracer molecules at a steady rate, with a flow restrictor creating a pressure gradient between inlet and outlet apertures, allowing for the estimation of pressure differences and gradients along the wellbore by analyzing tracer flux transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pressure measurement methods are used to estimate wellbore pressure drawdown, then the measurement system is simple, but the measurement precision is insufficient to accurately model inflow profiles
Solution Approach 1:
The patent introduces tracer molecules as an intermediary substance to indirectly measure pressure gradients and flow rates. Instead of directly measuring pressure at multiple points, tracers are released into the wellbore fluid and their concentration variations downstream provide information about pressure drawdown and inflow profiles, transforming a difficult direct measurement problem into a more manageable tracer transport problem
Solution Approach 2:
The patent replaces traditional mechanical pressure measurement systems with a tracer-based measurement approach. Rather than using pressure sensors and transducers throughout the wellbore, the system uses chemical tracers whose transport and concentration distribution reflect the pressure and flow conditions, substituting a complex mechanical measurement network with a simpler tracer injection and sampling system
2Quantity of substance
If tracer systems are placed in parallel slot spaces around a base pipe, then the tracer release capability is improved, but the device complexity increases due to multiple components
Solution Approach 1:
The patent combines multiple tracer release functions into a single integrated flow shunt chamber structure. Instead of having separate tracer release mechanisms in parallel slot spaces, the invention merges the tracer release function into the flow shunt chamber that already serves to divert flow, thereby achieving tracer release without adding significant structural complexity
Solution Approach 2:
The flow shunt chamber is designed to serve multiple functions: it acts as both a flow diversion device and a tracer release mechanism. The chamber receives tracer-laden fluid from the annulus, allows tracer release into the production stream, and maintains flow control, thereby combining multiple functions into a single universal component that reduces overall system complexity
3Stress or pressure
If flow restrictors are added to create pressure gradients for tracer release, then the pressure gradient control is improved, but the device complexity increases
Solution Approach 1:
The flow restrictor in the flow shunt chamber is designed to automatically create the necessary pressure gradient for tracer release without requiring external control mechanisms. The restrictor geometry itself generates the pressure differential needed to drive tracer-laden fluid through the chamber and into the production stream, allowing the system to self-regulate pressure gradients based on flow conditions without additional actuators or control systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables precise estimation of pressure differences and gradients, providing a detailed pressure profile from the 'toe' to the 'heel' of the production zone, improving the understanding of fluid flow and inflow conditions within the wellbore.
Implementation Method 1
a flow restrictor (7) arranged between said tracer system (2) and said second outlet aperture (6), allowing a pressure gradient between said inlet and outlet apertures (6, 5) driving said shunt chamber fluid (F3) out via said flow restrictor (7)
Implementation Method 2
a tracer system (2) in said shunt flow passage (4), said tracer system (2) exposed to and arranged for releasing unique tracer molecules (3) at a generally even release time rate to said shunt chamber fluid (F3)
Data Source
AI summary
A petroleum well tracer release flow shunt chamber in an annulus space about a base pipe and method of estimating one or more pressure differences or gradients, wherein the flow shunt chamber extending generally axial-parallel with the base pipe, and provided with a shunt flow passage for holding a shunt chamber fluid, and including a tracer system exposed to and arranged for releasing unique tracer molecules at a generally even release time rate to the shunt chamber fluid, a first inlet aperture for receiving a first fluid, a second outlet aperture for releasing the shunt chamber fluid to a fluid, a flow restrictor allowing a pressure gradient between the inlet and outlet apertures driving the shunt chamber fluid out via the flow restrictor.